Fits the viewport to a desired aspect ratio and displays black bars above and below the viewport. Great for cutscenes.

Parameters
- Aspect - The desired aspect ratio of the viewport, represented by a single decimal value (width / height). Here is a quick guide to common aspect ratios and the values you should use:
- 12 : 5 - use 2.4
- 21 : 9 - use 2.333
- 16 : 9 - use 1.777
- 5 : 3 - use 1.666
- 3 : 2 - use 1.5
- 4 : 3 - use 1.333
- 5 : 4 - use 1.25